Solar geoengineering holds promise for reducing global temperatures. Absent international agreements, it could also spark conflict.
It envisions a near future in which, among other developments, India decides unilaterally to deploy solar geoengineering in defiance of a global ban after a heat wave kills 20 million of its citizens. Former president Barack ObamaSome policymakers say that as the discussion evolves, existing tensions could worsen between industrialized nations that are responsible for the bulk of historic carbon emissions and less industrialized countries that are often hit hardest by climate change.
In the global south, he said, solar geoengineering “may appear appealing given the context of dire climate consequences faced by them.”could turn controversial in some areas, some people say, let alone full-scale deployment. Some scientists say the risks could be significant. Changes to the atmosphere would shift weather patterns and create droughts. A less-intense sun could lower crop yields and lead to hunger. There are concerns temperatures could build outside the sulfur dioxide layer that, if the spraying is stopped, could unleash a catastrophic heat wave across the world.
In the United States, research has also been expanding. “There’s a wealth of scientific evidence in the last decade that these technologies really could significantly reduce the human environmental costs of climate change,” said David Keith, a scientist at Harvard who is a prominent researcher in the field.outdoor testing.
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